14.WHAT ARE THE APPLICATION OF LENS? VERY IMPORTANT
1.DO PRACTICE OF ALL THE RAY DIAGRAMS WITH DIFFERENT POSITION OF OBJECTS WITH CONVEX LENS AS WELL AS CONCAVE LENS.
2.COMPLETE ALL THE QUESTIONS GIVEN IN BACK EXCERSIZE.

Convex lenses are used to correct farsighted vision problems. Similarly, concave lenses are used to correct nearsightedness. Compound microscopes and telescopes use both convex and concave lenses. Using combinations of convex lenses may create blurry images.

note: the given question is incomplete.

complete question is given below.

which is an example of kinetic energy?

a. the energy stored in ethanol  

b. a hockey puck sliding across the ice  

c. a compressed spring  

d. a ball sitting at the top of a ramp

solution: the kinetic energy is the energy posses by the virtue of the motion of the object.

in the given options, a, c and d are the example of potential energy because it is the energy posses by the virtue of the rest of the object. but option b has the kinetic energy as the object is in motion.

hence, a hockey puck sliding across the ice   is the apex example of kinetic energy.

so, the option (b) a hockey puck sliding across the ice   is the correct option.